开云体育

Bill,
?this has been sorta done by a fellow named ryan flowers

hers the link:

MultiBand BITX40 Conversion

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73s
Dan kilner

Bill - nice video. You encouraged me to warm up my soldering iron and work on my CB to 10M conversion project.

73; Steve, N3SB

Steve,
What CB are you converting? Im curious since i do conversions also. I Have an uniden grant xl SSB? that just needed a crystal change and a little bit of tweaking of the coils.

73 magazine has many cb to 10 conversion articles.

Im planning to use an arduino with si5351 to make a vfo for it and inject the output to where the crystal sat with some minor circuit mods, so ican obtain a complete 10 meters spread and then couple it to a 6 meter transverter i have in stock.Havent decided if i want to put in fm or not for 29.6. Lots of repeater action up on the top end of 10.


73
David
ac9xh

I have a dumb question about converting a CB to 10 Meters.?
I have a cheap Cobra CB that isn't worth doing a conversion on. On a CB everything is channelized so when you convert one to 10 meters, is it still channelized??
--
'72

Hi Aaron - It depends on how you perform the conversion. With the SI5351 replacing the existing PLL, I have the ability to control the frequency in 10 Hz steps. It? may be possible to get even smaller steps than that, but I wanted to keep the control program simple. For AM operation, I'm actually stepping in 5 KHz steps.

Performing the conversion by swapping crystals is also possible, but custom crystals are not as easy to obtain as they used to be. The SI5351 approach is much more flexible, and not at all expensive. It even makes the alignment of the radio easier as the operating frequency can be slowly raised from 27 MHz while re-peaking all the coils for maximum, which is a lot easier than making one large frequency jump to 29 MHz and then starting with a radio that has no receiver sensitivity and no transmit power.

73; Steve, N3SB

Aaron,

Yes if the cb is channelized the conversion will also produce a channalized 10 meter version. As for clean? always place properly designed lpf filters in circuit.

Always.

the Cbs are known to be dirty somewhat even before? conversion. The uniden i converted is channalized like most ,even if they are SSB ,unless they have a "slider kit or whatever added to it. I installed proper 10 meter filtering in the radio in the finals section and also ,may be over kill but i pride myself for having clean spectral signals,even off all my QRP transceivers, i always use inline filters? for any given band i use. I have a series of them that has connectors on each end of the filter boards, so i just screw them in , inline.You can do this with the qrp labs filters. just buy some for the bands you want to work and each time you switch bands, put in the appropriate filter. To bypass the channalization, you can install a dgital vfo which takes the place of the conversion crystal or circuit. Mine, i have plans of removing the channel switch and install a 16x2 or some small tft type display to give whole band tuning.Depends on the easiest route for programming .HI HI

If everyone paid attention to the junk that comes out of their radio, it would be a more peaceful world HI HI.

73
David
ac9xh

I never though about getting inline filters. I have a couple of QRP radios that do nothing but gather dust because I think that their output is unclean. I have never had them checked though lol
--
'72

Aaron,

Just like Steve pointed out to, using an si5351 and maybe an adrduino to complete the vfo build will give you maximum choice. Uniden i converted , i could not find the exeact crystal, but in a ballpark arena which put mine in the 10 meter band. Thats why im putting in a digital vfo to replace that crystal.Once you have max peak, replace the old electrolytic caps, and replace the filtering in the finals, you wind up with a full 10 meter band ssb transceiver. Then figure the cost of the arduino,si5351, some wire,solder some elecrolytics if you re cap the radio, and the price of the used ssb cb, and the price of the conversion is most likely very low compared to a used 10 meter transceiver on ebay or even a dealer.Cheap way to get on ssb 10 meters .

Anyway,

I best get in and finish my homebrew raduino for my iubitx v6. Mark your raduino inspired me to build my own.

73
David
ac9xh

A block diagram of the conversion concept is attached.

Apologies to Bill for hijacking his thread. At least the conversion process requires the generation of some SolderSmoke.

73; Steve, N3SB

Aaron,

You always have to assume the outputs of any transceiver is unclean. I have friends with 1000 dollar radios that think their outputs are super clean and when you put them ona spectrum analyzer they are in some ways just as dirty. I wont say which brand i found this on.

If you dont have a spectrum analyzer you can always use an sdr dongle with software dispalyed on a computer monitor.

73
David
ac9xh

Steve,

I also must apologize. for the hijacking . the solder smoke video is incredible. I love the way he used copper foil on board with each board slightly isolated . incredible build!!!!

73
David
ac9xh

Gordan,

Amen on that. its always fun to do something which wasnt meant to be and make something better than what it was.

73
David
ac9xh